4. If the speed of a boy is 30 km per hour, then what is the distance traveled by him in 45 seconds ? O 375
Answers 1
Given:
Speed v = 30 km/hr
Time t = 45 s.
To Find:
Distance travelled.
Solution:
Speed = 30 km/hr
1 km = 1000 m
Thus, 30km = 30 × 1000 = 30000 m.
1 hr = 3600 seconds.
Thus,
30:km/hr = 30000/3600 m/s
= 8.33 m/s
Distance travelled = Speed × Time
= 8.33 × 45 = 374.85 which is approximately equal to 375 m.
The distance travelled by him is 375 m.
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